No it's not, because you still want to circumvent the fact that you don't have administrative access on the office computer. It requires administrative access to run a program (service) that does stuff like that automatically.
And even if you tweak the description further to make it ethical, the cat's out of the bag with your opening question so no matter how you rephrase it it's still an inethical question.

Also, don't you think she might get suspicious when she sticks her USB drive in and the light on it starts going mental even though she's doing nothing?